CNN Smerconish April 26, 2014 13:50:00
>> i want to put up on the screen a map of everest the climb. what is the most dangerous aspect of making that the line goes up through an ice fall, that's 2,000 feet of moving ice. it's very unstable. often left of that route is the left shoulder of everest. it came down and slit into car-sized pieces. that's what's killed 16 sherpa and there's three more missing. beyond that, that's called the south cull. at that point, it's just from an altitude issue. you're at 29,000 feet. that's where airplanes fly and you're on the ground. it's treacherous to the body.
Source: archive.org